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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.poifs.filesystem;

/**
 * This interface defines behaviors for objects managed by the Block
 * Allocation Table (BAT).
 *
 * @author Marc Johnson (mjohnson at apache dot org)
 */

public interface BATManaged
{

    /**
     * Return the number of BigBlock's this instance uses
     *
     * @return count of BigBlock instances
     */

    int countBlocks();

    /**
     * Set the start block for this instance
     *
     * @param index index into the array of BigBlock instances making
     *              up the the filesystem
     */

    void setStartBlock(final int index);
}   // end public interface BATManaged